How can I see the downloaded candles?

At the moment there's no built-in way to see the downloaded candles.

For now, you can use some kind of database management software such as Tableplus to do some browsing.

However, in most cases you may not need to see them. You can simply re-import candles and let Jesse worry about it. Because duplicate candles will be skipped, hence it won't take long to re-import the candles.